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<title>无标题文档</title>
<script>
var arr=[['a','b','c'],['d','e','f'],['g','h','i'],['j','k','l']];
var res=[];
for(var i=0;i<arr[0].length;++i)
{res[i]=[];
for(var j=0;j<arr.length;++j)
{
	res[i][j]=arr[j][i];}
}
console.group('转置前：');
console.log(arr);
console.group('转置后：');
console.log(res);
console.groupEnd();

</script>
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<body>

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